A bond between two atoms with an electronegativity difference of 0.5 and a bond length of 1.5 is likely a polar covalent bond. In general, when the electronegativity difference between two atoms is between 0.4 and 1.7, the bond is considered polar covalent. This means that the electrons are shared between the two atoms, but not equally, resulting in a partially positive and partially negative charge on each atom. The bond length of 1.5 is within the typical range for covalent bonds.